package juc;

import java.util.Random;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;

public class MySemaPhore {
    public static void main(String[] args) {
        Semaphore semaphore = new Semaphore(3);
        for (int i=1;i<=6;i++){
            new Thread(()->{
                try {
                    semaphore.acquire();//抢到车位
                    System.out.println(Thread.currentThread().getName()+" 抢到车位");
                    TimeUnit.SECONDS.sleep(3);
                    System.out.println(Thread.currentThread().getName()+" 离开车位");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }finally {
                    semaphore.release();
                }
            },i+"").start();
        }
    }
}
